Dietas de baixa proteína no desempenho de frangos criados em diferentes temperaturas
Carregando...
Data
2006-01-01
Autores
Faria Filho, Daniel Emygdio de [UNESP]
Rosa, Paulo Sérgio [UNESP]
Figueiredo, Denise Fontana [UNESP]
Dahlke, Fabiano [UNESP]
Macari, Marcos [UNESP]
Furlan, Renato Luis [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Resumo
O objetivo deste trabalho foi avaliar o desempenho de frangos, entre 42 e 49 dias, alimentados com dietas de baixa proteína e criados em diferentes temperaturas. Foram utilizados 360 frangos, machos, Cobb-500, distribuídos em um delineamento inteiramente ao acaso em esquema fatorial 3x3 (temperatura ambiente de 20, 25 e 32ºC e dietas com teores de proteína bruta de 18,0, 16,5 e 15,0%), com quatro repetições de dez aves cada. As dietas com baixa proteína prejudicaram o desempenho e a eficiência de retenção de nitrogênio dos frangos criados em 32ºC. Os rendimentos de carcaça e de coxa e sobrecoxa foram maiores nas aves criadas a 32ºC. Os demais cortes e a deposição de gordura abdominal não foram alterados. O estresse por calor reduziu o teor de proteína e aumentou o de gordura na coxa e sobrecoxa, ao passo que os teores protéicos não alteraram a composição bromatológica dos cortes. A utilização de dietas com baixa proteína piora o desempenho de frangos, de 42 a 49 dias, criados em estresse por calor. No entanto, essas dietas podem ser utilizadas em frangos criados em 20 ou 25ºC, pois não alteram o desempenho, a qualidade da carcaça e diminuem a excreção de nitrogênio.
The objective of this work was to evaluate broilers performance, from 42 to 49 days, fed on low-protein diet and reared under different temperatures. Three hundred and sixty male broilers from Cobb-500 strain were randomly housed in a 3x3 factorial arrangement (environmental temperature of 20, 25 and 32ºC and crude protein levels of 18.0, 16.5 and 15.0%) with four replicates of ten birds each. Performance and efficiency of nitrogen retention were impaired in broilers fed on low-protein diets and reared under temperature of 32ºC. Carcass, as well as thigh and drumstick increased in birds reared at hot temperature yield, however other parts yield, and abdominal fat deposition were not altered by the studied factors. Drumstick and thigh protein composition decreased in broilers reared under heat stress, while fat composition increased. Protein levels did not affect carcass composition. Low-protein diet impairs broiler performance in heat-exposed broilers from 42 to 49 days. However, broilers can be fed on low-protein diets under temperatures of 20 or 25ºC, because these temperatures did not affect broilers performance, carcass quality, and they promoted lower nitrogen excretion.
The objective of this work was to evaluate broilers performance, from 42 to 49 days, fed on low-protein diet and reared under different temperatures. Three hundred and sixty male broilers from Cobb-500 strain were randomly housed in a 3x3 factorial arrangement (environmental temperature of 20, 25 and 32ºC and crude protein levels of 18.0, 16.5 and 15.0%) with four replicates of ten birds each. Performance and efficiency of nitrogen retention were impaired in broilers fed on low-protein diets and reared under temperature of 32ºC. Carcass, as well as thigh and drumstick increased in birds reared at hot temperature yield, however other parts yield, and abdominal fat deposition were not altered by the studied factors. Drumstick and thigh protein composition decreased in broilers reared under heat stress, while fat composition increased. Protein levels did not affect carcass composition. Low-protein diet impairs broiler performance in heat-exposed broilers from 42 to 49 days. However, broilers can be fed on low-protein diets under temperatures of 20 or 25ºC, because these temperatures did not affect broilers performance, carcass quality, and they promoted lower nitrogen excretion.
Descrição
Palavras-chave
Amino acids, Nitrogen, Carcass, Stress, Aminoácidos, Nitrogênio, Carcaça, Estresse
Como citar
Pesquisa Agropecuária Brasileira. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Informação TecnológicaPesquisa Agropecuária Brasileira, v. 41, n. 1, p. 101-106, 2006.